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Consolidiated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net income (loss) | $ 278,570 | $ (754) | $ 213,026
Net unrealized gain (loss) on derivative instruments qualifying as hedges: |  |  |
Net unrealized gain (loss) on derivative instruments arising during the period, net of tax of $(3,116), $4,829 and $4,683 in 2013, 2012 and 2011, respectively | (5,594) | 8,497 | 7,900
Reclassification adjustment for (gain) loss on derivative instruments included in net income, net of tax of $(2,548), $(5,141) and $0 in 2013, 2012 and 2011, respectively | (4,189) | (8,754) | 0
Net unrealized gain (loss) on derivative instruments qualifying as hedges | (9,783) | (257) | 7,900
Postretirement liability adjustment: |  |  |
Postretirement liability gains (losses) arising during the period, net of tax of $11,818, $(2,060) and $(14,205) in 2013, 2012 and 2011, respectively | 18,539 | (3,106) | (23,473)
Amortization of postretirement liability losses included in net periodic benefit cost, net of tax of $1,276, $1,379 and $632 in 2013, 2012 and 2011, respectively | 2,001 | 2,079 | 1,046
Postretirement liability adjustment | 20,540 | (1,027) | (22,427)
Foreign currency translation adjustment: |  |  |
Foreign currency translation adjustment recognized during the period, net of tax of $(177), $(296) and $(767) in 2013, 2012 and 2011, respectively | (299) | (476) | (1,189)
Reclassification adjustment for (gain) loss on foreign currency translation adjustment included in net income, net of tax of $70, $2 and $(65) in 2013, 2012 and 2011, respectively | 143 | 3 | (106)
Foreign currency translation adjustment | (156) | (473) | (1,295)
Net unrealized gain (loss) on available-for-sale investments: |  |  |
Net unrealized loss on available-for-sale investments arising during the period, net of tax of $(105), $(52) and $(20) in 2013, 2012 and 2011, respectively | (194) | (97) | (36)
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $59, $72 and $64 in 2013, 2012 and 2011, respectively | 109 | 134 | 118
Net unrealized gain (loss) on available-for-sale investments | (85) | 37 | 82
Other comprehensive income (loss) | 10,516 | (1,720) | (15,740)
Comprehensive income (loss) | 289,086 | (2,474) | 197,286
Comprehensive loss attributable to noncontrolling interest | (363) | 0 | 0
Comprehensive income (loss) attributable to common stockholders | 289,449 | (2,474) | 197,286
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract] |  |  |
Net unrealized gain (loss) on derivative instruments arising during the period, tax | (3,116) | 4,829 | 4,683
Reclassification adjustment for (gain) loss on derivative instruments included in net income, tax | (2,548) | (5,141) | 0
Postretirement liability gains (losses) arising during the period, tax | 11,818 | (2,060) | (14,205)
Amortization of postretirement liability losses included in net periodic benefit cost, tax | 1,276 | 1,379 | 632
Foreign currency translation adjustment recognized during the period, tax | (177) | (296) | (767)
Reclassification adjustment for (gain) loss on foreign currency translation adjustment included in net income, tax | 70 | 2 | (65)
Net unrealized gains (losses) on available-for-sale investments arising during the period, tax | (105) | (52) | (20)
Reclassification adjustments for (gain) loss on available-for-sale investments included in net income, tax | $ 59 | $ 72 | $ 64

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